[libvirt] with vhostuser I cannot use hugepages

Adnan Mundres amundres at yahoo.com
Wed Jan 24 21:49:15 UTC 2018

That was it. Really appreciate. I changed it correctly and it is working. 
Thanks again for your help 

    On Wednesday, January 24, 2018 1:20 PM, "Mooney, Sean K" <sean.k.mooney at intel.com> wrote:

 #yiv5366243845 #yiv5366243845 -- _filtered #yiv5366243845 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv5366243845 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv5366243845 {}#yiv5366243845 #yiv5366243845 p.yiv5366243845MsoNormal, #yiv5366243845 li.yiv5366243845MsoNormal, #yiv5366243845 div.yiv5366243845MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv5366243845 a:link, #yiv5366243845 span.yiv5366243845MsoHyperlink {color:blue;text-decoration:underline;}#yiv5366243845 a:visited, #yiv5366243845 span.yiv5366243845MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv5366243845 p.yiv5366243845msonormal, #yiv5366243845 li.yiv5366243845msonormal, #yiv5366243845 div.yiv5366243845msonormal {margin-right:0cm;margin-left:0cm;font-size:12.0pt;}#yiv5366243845 p.yiv5366243845msochpdefault, #yiv5366243845 li.yiv5366243845msochpdefault, #yiv5366243845 div.yiv5366243845msochpdefault {margin-right:0cm;margin-left:0cm;font-size:12.0pt;}#yiv5366243845 span.yiv5366243845msohyperlink {}#yiv5366243845 span.yiv5366243845msohyperlinkfollowed {}#yiv5366243845 span.yiv5366243845emailstyle17 {}#yiv5366243845 span.yiv5366243845emailstyle18 {}#yiv5366243845 p.yiv5366243845msonormal1, #yiv5366243845 li.yiv5366243845msonormal1, #yiv5366243845 div.yiv5366243845msonormal1 {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv5366243845 span.yiv5366243845msohyperlink1 {color:#0563C1;text-decoration:underline;}#yiv5366243845 span.yiv5366243845msohyperlinkfollowed1 {color:#954F72;text-decoration:underline;}#yiv5366243845 span.yiv5366243845emailstyle171 {color:#1F497D;}#yiv5366243845 span.yiv5366243845emailstyle181 {color:#1F497D;}#yiv5366243845 p.yiv5366243845msochpdefault1, #yiv5366243845 li.yiv5366243845msochpdefault1, #yiv5366243845 div.yiv5366243845msochpdefault1 {margin-right:0cm;margin-left:0cm;font-size:10.0pt;}#yiv5366243845 span.yiv5366243845EmailStyle29 {color:#1F497D;}#yiv5366243845 .yiv5366243845MsoChpDefault {font-size:10.0pt;} _filtered #yiv5366243845 {margin:72.0pt 72.0pt 72.0pt 72.0pt;}#yiv5366243845 div.yiv5366243845WordSection1 {}#yiv5366243845 Ah I see the error    You have <memoryBacking>     <hugepages/>       <page size='1' unit='G' nodeset='0'/>   </memoryBacking>       Not <memoryBacking>     <hugepages>       <page size='1' unit='G' nodeset='0'/>     </hugepages>   </memoryBacking>       From: Adnan Mundres [mailto:amundres at yahoo.com]
Sent: Wednesday, January 24, 2018 9:05 PM
To: Mooney, Sean K <sean.k.mooney at intel.com>; libvir-list at redhat.com
Subject: Re: [libvirt] with vhostuser I cannot use hugepages    Hi Sean  ,    Thanks for you reply. I do have hugepages configuration in my xml and still it is not getting the memory from Hugepage. Following is my complete xml file    <domain type='kvm'>   <uuid>c1f7a3d0-ccb7-4a85-b0f0-dd4bab73ba54</uuid>   <description>Timos VM</description>   <memory>16777216</memory>   <currentMemory>16777216</currentMemory>   <cpu mode='host-model'>     <numa>       <cell id="0" cpus="0" memory="16777216" unit='KiB' memAccess="shared"/>     </numa>    </cpu>   <memoryBacking>     <hugepages/>       <page size='1' unit='G' nodeset='0'/>   </memoryBacking>   <numatune>     <memory mode='strict' nodeset='1'/>   </numatune>   <vcpu current='7'>7</vcpu>   <cputune>     <vcpupin vcpu='0' cpuset='2'/>     <vcpupin vcpu='1' cpuset='3'/>     <vcpupin vcpu='2' cpuset='4'/>     <vcpupin vcpu='3' cpuset='5'/>     <vcpupin vcpu='4' cpuset='6'/>     <vcpupin vcpu='5' cpuset='7'/>     <vcpupin vcpu='6' cpuset='8'/>     <emulatorpin cpuset="0,1"/>   </cputune>   <os>     <type arch='x86_64' machine='pc'>hvm</type>     <smbios mode='sysinfo'/>   </os>   <sysinfo type ='smbios'   <clock offset='utc'>     <timer name='pit' tickpolicy='delay'/>     <timer name='rtc' tickpolicy='delay'/>   </clock>   <devices>     <emulator>/usr/libexec/qemu-kvm</emulator>     <disk type='file' device='disk'>       <driver name='qemu' type='qcow2' cache='none'/>       <source file='/mvmgptb11/images/flexibed/vm_5/sros-vm.qcow2'/>       <target dev='hda' bus='virtio'/>     </disk>     <interface type='bridge'>       <mac address='FA:AC:A5:00:7E:00'/>       <source bridge='breth0'/>       <model type='virtio'/>     </interface>     <interface type='bridge'>       <mac address='FA:AC:A5:00:7E:01'/>       <source bridge='breth1'/>       <model type='virtio'/>     </interface>     <interface type='vhostuser'>       <mac address='FA:AC:A5:00:7E:02'/>       <source type='unix' path='/var/run/openvswitch/vhost-user-1' mode='client'/>       <model type='virtio'/>     </interface>     <interface type='vhostuser'>       <mac address='FA:AC:A5:00:7E:04'/>       <source type='unix' path='/var/run/openvswitch/vhost-user-3' mode='client'/>       <model type='virtio'/>     </interface>     <interface type='vhostuser'>       <mac address='FA:AC:A5:00:7E:05'/>       <source type='unix' path='/var/run/openvswitch/vhost-user-2' mode='client'/>       <model type='virtio'/>     </interface>     <console type='tcp'>       <source mode='bind' host='' service='2501'/>       <protocol type='telnet'/>       <target type='virtio' port='0'/>     </console>     <watchdog model='i6300esb' action='reset'/>   </devices>   <seclabel type='none'/> </domain>                                                                                  On Wednesday, January 24, 2018 12:54 PM, "Mooney, Sean K" <sean.k.mooney at intel.com> wrote:        From: Mooney, Sean K
Sent: Wednesday, January 24, 2018 8:52 PM
To: Adnan Mundres <amundres at yahoo.com>;libvir-list at redhat.com
Cc: Mooney, Sean K <sean.k.mooney at intel.com>
Subject: RE: [libvirt] with vhostuser I cannot use hugepages       From:libvir-list-bounces at redhat.com [mailto:libvir-list-bounces at redhat.com]On Behalf Of Adnan Mundres
Sent: Wednesday, January 24, 2018 6:54 PM
To: libvir-list at redhat.com
Subject: [libvirt] with vhostuser I cannot use hugepages   In my setup I am using qemu-kvm without openstack. I am trying to use ovs with dpdk. In my xml file I added following lines for the dpdkvhostuser   <cpu mode='host-passthrough'>     <numa>       <cell id="0" cpus="0-6" memory="16777216" unit='KiB' memAccess="shared"/>     </numa>  </cpu> [Mooney, Sean K] this xml snippit is not requsting the use of huge page memory. It is requesting memory to be allocated form a single numa node  and for that to be mmaped shared. Dpdk does not actually need the guest to use hugepages it just improves the performance. What it requires Is that the gues uses file descriptor backed, pre allocated, locked, shared memory. e.g.   <memoryBacking>     <locked/>     <source type='file'/>     <access mode='shared'/>     <allocation mode='immediate'/>   </memoryBacking>   Hugepages will enable all of the above features implicitly.   to enable hugepages  add   <memoryBacking> <hugepages>       <page size="16" unit="G" nodeset="0"/>     </hugepages> </memoryBacking>    [Mooney, Sean K]  oh I forgot to say you can find the relevant documentation herehttps://libvirt.org/formatdomain.html#elementsMemoryBacking   I have enabled hugepages during boot time   ot at mvmgptb11hyp01 hyp-1]# cat /proc/meminfo | grep -i huge AnonHugePages: 126976 kB HugePages_Total: 100 HugePages_Free: 80 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 1048576 kB   But When I start my vm (virsh start vm1.xml) I am seeing that this vm is not using memory from hugepages, rather it is taking memory from total memory. When I checked the log file I see that it is using   -object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/var/lib/libvirt/qemu/ram,share=yes   It should use backend memory as following   -object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu/vm1,share=yes   Any idea how can I use memory from hugepages    --
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